mjo/eja/eja_operator.py: add some "long time" labels

diff --git a/mjo/eja/eja_operator.py b/mjo/eja/eja_operator.py
index 0f1652a3eb9999be8999ba167c55d8348ab23f89..698bc87b96e50c648d67fb1b4f0a31cacdf0586b 100644 (file)
--- a/mjo/eja/eja_operator.py
+++ b/mjo/eja/eja_operator.py
@@ -866,7 +866,9 @@ class EJAOperator(Map):
 
         Again we repeat with a _specific_ example whose scalars are
         algebraic; anything larger than this takes too long (though
-        `n=3` is doable if you're willing to wait five minutes)::
+        `n=3` is doable if you're willing to wait five minutes). Even
+        this one can be slow if your random algebraic numbers are
+        unlucky::
 
             sage: J = ComplexHermitianEJA(2)
             sage: U = random_unitary_matrix(QQbar, 2)
@@ -875,25 +877,25 @@ class EJAOperator(Map):
             sage: L = lambda X: J((UU.conjugate_transpose()*X*UU))
             sage: columns = ( L(b).to_vector() for b in J.matrix_basis() )
             sage: MS = MatrixSpace(J.base_ring(), J.dimension(), J.dimension())
-            sage: M = MS(columns).transpose()
-            sage: L = EJAOperator(J,J,M)
-            sage: L.is_isomorphism()
+            sage: M = MS(columns).transpose()  # long time
+            sage: L = EJAOperator(J,J,M)       # long time
+            sage: L.is_isomorphism()           # long time
             True
-            sage: L.inverse().is_isomorphism()
+            sage: L.inverse().is_isomorphism() # long time
             True
-            sage: (L^2).is_isomorphism()
+            sage: (L^2).is_isomorphism()       # long time
             True
 
             sage: L = lambda X: J((UU.conjugate_transpose()*X.conjugate()*UU))
             sage: columns = ( L(b).to_vector() for b in J.matrix_basis() )
             sage: MS = MatrixSpace(J.base_ring(), J.dimension(), J.dimension())
-            sage: M = MS(columns).transpose()
-            sage: L = EJAOperator(J,J,M)
-            sage: L.is_isomorphism()
+            sage: M = MS(columns).transpose()   # long time
+            sage: L = EJAOperator(J,J,M)        # long time
+            sage: L.is_isomorphism()            # long time
             True
-            sage: L.inverse().is_isomorphism()
+            sage: L.inverse().is_isomorphism()  # long time
             True
-            sage: (L^2).is_isomorphism()
+            sage: (L^2).is_isomorphism()        # long time
             True
 
         TESTS: